Aurora,
you will be fine at a Chabad event.
While I do have reservations about Chabad, Their outreach is great and the people they send out for outreach are really socialble people. People who are really friendly many times in a hostile evironment. Also its likley the people you will see there are more like yourself than you think.
I really think you will enjoy yourself and unlike a shabbos or other Holiday you can leave and drive away whenever you want